2-Imino-2,3-dihydrobenzoxazole—a useful platform for designing rare- and alkaline earth complexes with variable di- and trianionic O,N,N, ligands

Abstract

The reactions of 2-imino-2,3-dihydrobenzoxazole LH with M[N(SiMe3)2]2(THF)2 (M = Yb, Ca) and Y(CH2SiMe3)3(THF)2 proceed with opening of dihydrobenzoxazol ring and elimination of HN(SiMe3)2 or SiMe4. Besides in the case of...

Stability and Solution Behavior of [(dpp-Bian)Ln] and [(dpp-Bian)LnX] (Ln = Yb, Tm, or Dy; X = I, F, or N3)

“…Redox-active ligands can significantly improve the chemical or physical properties of lanthanide atoms. For example, they allowed multielectron transfer reactions for trivalent atoms, , bond formation reactions, and C–H bond activation . Lanthanide atoms complexated with redox-active ligands exhibited a number of interesting magnetic properties, − e.g., those of an exchange-coupled lanthanide radical single-molecular magnet and luminescent and electrochemical properties. − That allowed them to be employed as switchable materials, biosensors, − catalysts for controlled copolymerization, and agents for rare-earth element separations …”

Investigation of four Cd(ii) sulfonate complexes: crystal structure, Hirshfeld surface analysis, thermogravimetric and spectroscopic properties

“…[1][2][3] The research on complexes has been focused on organic carboxylic acid ligands, organic phosphate ligands, and nitrogen-containing ligands because of the strong coordination ability of O and N atoms, [4][5][6] which can lead to self-assembly with many metal ions, including alkali, transition and rare earth metals, forming compounds with different dimensional network topologies. [7][8][9][10][11][12] In contrast to the ligands mentioned above, the sulfonate groups are more hydrophilic and ionic and have weaker coordination capabilities than water. During reactive self-assembly, organic sulfonate ligands hardly participate in coordination and usually form one-dimensional chain structures of hydrated metal ions, and sulfonate ligands exist as anti anionic ions, forming hydrogen bonds with the coordinating water molecules and interspersed in an ordered manner in one-dimensional chains, 13,14 thus sulfonate ligands are considered to be a weak ligand and have not been extensively and systematically studied.…”

Synthesis, Characterization, and Reactivity Studies of New Cyclam-Based Y(III) Complexes

“…In this context, yttrium complexes have attracted much attention due to their high reactivity in intramolecular hydroamination [2][3][4][5][6][7][8][9][10] as well as olefin [11][12][13][14] and cyclic ester [15][16][17][18][19][20] polymerization catalysis. The hard Lewis acid nature of yttrium explains its tendency to coordinate to ligands that contain oxygen and nitrogen donors [21][22][23][24][25][26][27][28]. Although a rich chemistry of delocalized systems possessing aminato, guanidinato, and β-diketiminato ligands have emerged, chelating dianionic diamido ligands with located charges seemed to be depreciated and far from reaching those levels of importance.…”